| Index | Castine | Maine | National |
| Average Test Scores | 75% | 45% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 345 | 79,221 |
| Total private schools | n/a | 89 | 24,874 |
| Total post-secondary schools | n/a | 45 | 7,963 |
| Index | Castine | Maine | National |
| Completed 8th grade | 94.6% | 88.3% | 84.3% |
| Completed high school | 94.6% | 86.8% | 83.0% |
| Completed some college | 87.4% | 58.8% | 59.4% |
| Completed associate degree | 71.6% | 39.0% | 38.5% |
| Completed bachelors | 67.1% | 29.3% | 30.3% |
| Completed masters | 41.4% | 10.5% | 11.5% |
| Completed professional degree | 18.5% | 3.0% | 3.3% |
| Completed doctorate | 13.1% | 1.3% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Castine. Using the proficiency score averages, the average test scores for Castine, ME schools is 75%. The average student to teacher ratio is n/a. In Castine, ME, an average of 94.6% of students have completed 8th grade and an average of 94.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Camden, ME | 3,543 | 59% | 22.9% |
| Blue Hill, ME | 1,216 | 45% | 7.3% |
| Belfast, ME | 6,710 | 39% | 19.8% |
| Searsport, ME | 1,039 | 32% | 33.0% |
| Castine, ME | 813 | 75% | 56.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Bruce, WI | 813 | 36% | 24.3% |
| Cottondale, FL | 813 | 59% | 21.9% |
| Elkton, SD | 813 | 39% | 19.8% |
| Blackduck, MN | 813 | 46% | 4.7% |
| Keysville, VA | 814 | 92% | 91.7% |
| Castine, ME | 813 | 75% | 56.3% |
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